2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Chronic Obstructive Pulmonary Disease And Allied Conditions 490-496 > Chronic Bronchitis 491.* >  2008 ICD-9-CM Diagnosis 491.20
Obstructive chronic bronchitis without exacerbation On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date.
The 2009 version of ICD-9-CM 491.20 can be accessed here. - 491.20 is a specific code that can be used to specify a diagnosis
- 491.20 contains 12 index entries
- View the ICD-9-CM Volume 1 491.* hierarchy
491.20 also known as:- Emphysema with chronic bronchitis
Index entries containing 491.20:- Blue
- bloater
 491.20
Bronchitis (diffuse) (hypostatic) (infectious) (inflammatory) (simple) 490- with
- obstruction airway, chronic 491.20
- chronic 491.9
- obstructive 491.20
- emphysematous 491.20
- obstructive (chronic) 491.20
Disease, diseased - see also Syndrome- lung NEC 518.89
- obstructive (chronic) (COPD) 496
- with
- bronchitis (chronic) 491.20
- pulmonary - see also Disease, lung
- obstructive diffuse (chronic) 496
- with
- bronchitis (chronic) 491.20
Emphysema (atrophic) (centriacinar) (centrilobular) (chronic) (diffuse) (essential) (hypertrophic) (interlobular) (lung) (obstructive) (panlobular) (paracicatricial) (paracinar) (postural) (pulmonary) (senile) (subpleural) (traction) (unilateral) (unilobular) (vesicular) 492.8- with bronchitis
- chronic 491.20
Obstruction, obstructed, obstructive- airway NEC 519.8
- with
- bronchitis (see also Bronchitis, with, obstruction) 491.20
- chronic 496
- with
- bronchitis (chronic) (see also Bronchitis, chronic, obstructive) 491.20
- lung 518.89
- with
- bronchitis (chronic) 491.20
Syndrome - see also Disease- blue
- bloater 491.20
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